Recently my 12 year old Klipsch Promedia 4.1 speakers died. I was listening to the new Animal Collective album Centipede Hz and the sub blew when the volume was only at 25% and the sub set to about 30 or 40%. I guess it was just time to give up the ghost. Not sure what happened there.

I have both both Audioengine 5's, and 2's, and am super happy with them. The 5's suffice without the need for a subwoofer (though add it if you like, it will be an enhancement). I have the 2's set up with a sub (although not the Audioengine one, I happened to have an Earthquake Supernova MkIV available), and it is a genuinely great sounding stereo system. And feeding my computer USB output through an external DAC/headphone amp helps too.